var fieldstocheck = new Array(); 
fieldnames = new Array(); 
function checkform() { 
for (i=0;i<fieldstocheck.length;i++) { 
if (eval("document.subscribeform.elements['"+fieldstocheck[i]+"'].value") == "") { 
alert("Please enter your "+fieldnames[i]); 
eval("document.subscribeform.elements['"+fieldstocheck[i]+"'].focus()"); 
return false; 
} 
} 
return true; 
} 
function addFieldToCheck(value,name) { 
fieldstocheck[fieldstocheck.length] = value; 
fieldnames[fieldnames.length] = name; 
}